The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 494
, as shown. A needle attached to the combinedcoils moves over a graduated scale. The current coil is joined directly in the line circuit,while the pressure coil is joined as a shunt. With a highresistance in the line, the latter coil gets nearly all the current,and tends to set in the gap at right… … Fig. 442.—Connections of Megger taken by the combination is due to the resultant of the twoopposing forces. In the instrument generally used for telephone work thegenerator produces a voltage of 500 volts at 100 revolutionsper minute, and the scale is graduated from 01 to 100 meg-ohms. There are…
Telephone
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